The following functions are only
available during a call:
Switch the microphone on or
off. If switched off, the person
on the other end of the line
cannot hear you (muting).
However, numbers being en-
tered are audible when
Adjust handset volume.
While the connection contin-
ues, the call duration and
(if set, see p. 44) the charge
details are displayed.
Direct access to the main
List all held and active calls
(e.g. participants in a
Making a phone call
You can enter control codes (digits)
during a call so that an answering
machine can be controlled remotely.
These digits are directly transmitted
as DTMF tones (control codes).
Control codes (DTMF tones) stored
in the Phonebook (p. 18) can also be